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252 lines
10 KiB
C
252 lines
10 KiB
C
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/** @file
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Dummy implementation of Legacy Region 2 Protocol.
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This generic implementation of the Legacy Region 2 Protocol does not actually
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perform any lock/unlock operations. This module may be used on platforms
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that do not provide HW locking of the legacy memory regions. It can also
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be used as a template driver for implementing the Legacy Region 2 Protocol on
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a platform that does support HW locking of the legacy memory regions.
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Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <LegacyRegion2.h>
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EFI_HANDLE mLegacyRegion2Handle = NULL;
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EFI_LEGACY_REGION2_PROTOCOL mLegacyRegion2 = {
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LegacyRegion2Decode,
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LegacyRegion2Lock,
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LegacyRegion2BootLock,
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LegacyRegion2Unlock,
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LegacyRegionGetInfo
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};
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/**
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Modify the hardware to allow (decode) or disallow (not decode) memory reads in a region.
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If the On parameter evaluates to TRUE, this function enables memory reads in the address range
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Start to (Start + Length - 1).
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If the On parameter evaluates to FALSE, this function disables memory reads in the address range
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Start to (Start + Length - 1).
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@param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
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@param Start[in] The beginning of the physical address of the region whose attributes
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should be modified.
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@param Length[in] The number of bytes of memory whose attributes should be modified.
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The actual number of bytes modified may be greater than the number
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specified.
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@param Granularity[out] The number of bytes in the last region affected. This may be less
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than the total number of bytes affected if the starting address
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was not aligned to a region's starting address or if the length
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was greater than the number of bytes in the first region.
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@param On[in] Decode / Non-Decode flag.
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@retval EFI_SUCCESS The region's attributes were successfully modified.
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@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegion2Decode (
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IN EFI_LEGACY_REGION2_PROTOCOL *This,
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IN UINT32 Start,
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IN UINT32 Length,
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OUT UINT32 *Granularity,
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IN BOOLEAN *On
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)
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{
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if ((Start < 0xC0000) || ((Start + Length - 1) > 0xFFFFF)) {
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return EFI_INVALID_PARAMETER;
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}
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ASSERT (Granularity != NULL);
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*Granularity = 0;
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return EFI_SUCCESS;
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}
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/**
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Modify the hardware to disallow memory writes in a region.
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This function changes the attributes of a memory range to not allow writes.
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@param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
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@param Start[in] The beginning of the physical address of the region whose
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attributes should be modified.
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@param Length[in] The number of bytes of memory whose attributes should be modified.
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The actual number of bytes modified may be greater than the number
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specified.
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@param Granularity[out] The number of bytes in the last region affected. This may be less
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than the total number of bytes affected if the starting address was
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not aligned to a region's starting address or if the length was
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greater than the number of bytes in the first region.
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@retval EFI_SUCCESS The region's attributes were successfully modified.
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@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegion2Lock (
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IN EFI_LEGACY_REGION2_PROTOCOL *This,
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IN UINT32 Start,
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IN UINT32 Length,
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OUT UINT32 *Granularity
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)
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{
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if ((Start < 0xC0000) || ((Start + Length - 1) > 0xFFFFF)) {
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return EFI_INVALID_PARAMETER;
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}
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ASSERT (Granularity != NULL);
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*Granularity = 0;
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return EFI_SUCCESS;
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}
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/**
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Modify the hardware to disallow memory attribute changes in a region.
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This function makes the attributes of a region read only. Once a region is boot-locked with this
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function, the read and write attributes of that region cannot be changed until a power cycle has
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reset the boot-lock attribute. Calls to Decode(), Lock() and Unlock() will have no effect.
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@param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
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@param Start[in] The beginning of the physical address of the region whose
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attributes should be modified.
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@param Length[in] The number of bytes of memory whose attributes should be modified.
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The actual number of bytes modified may be greater than the number
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specified.
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@param Granularity[out] The number of bytes in the last region affected. This may be less
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than the total number of bytes affected if the starting address was
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not aligned to a region's starting address or if the length was
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greater than the number of bytes in the first region.
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@retval EFI_SUCCESS The region's attributes were successfully modified.
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@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
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@retval EFI_UNSUPPORTED The chipset does not support locking the configuration registers in
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a way that will not affect memory regions outside the legacy memory
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region.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegion2BootLock (
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IN EFI_LEGACY_REGION2_PROTOCOL *This,
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IN UINT32 Start,
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IN UINT32 Length,
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OUT UINT32 *Granularity
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)
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{
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if ((Start < 0xC0000) || ((Start + Length - 1) > 0xFFFFF)) {
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return EFI_INVALID_PARAMETER;
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}
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return EFI_UNSUPPORTED;
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}
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/**
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Modify the hardware to allow memory writes in a region.
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This function changes the attributes of a memory range to allow writes.
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@param This[in] Indicates the EFI_LEGACY_REGION_PROTOCOL instance.
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@param Start[in] The beginning of the physical address of the region whose
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attributes should be modified.
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@param Length[in] The number of bytes of memory whose attributes should be modified.
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The actual number of bytes modified may be greater than the number
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specified.
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@param Granularity[out] The number of bytes in the last region affected. This may be less
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than the total number of bytes affected if the starting address was
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not aligned to a region's starting address or if the length was
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greater than the number of bytes in the first region.
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@retval EFI_SUCCESS The region's attributes were successfully modified.
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@retval EFI_INVALID_PARAMETER If Start or Length describe an address not in the Legacy Region.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegion2Unlock (
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IN EFI_LEGACY_REGION2_PROTOCOL *This,
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IN UINT32 Start,
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IN UINT32 Length,
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OUT UINT32 *Granularity
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)
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{
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if ((Start < 0xC0000) || ((Start + Length - 1) > 0xFFFFF)) {
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return EFI_INVALID_PARAMETER;
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}
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ASSERT (Granularity != NULL);
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*Granularity = 0;
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return EFI_SUCCESS;
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}
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/**
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Get region information for the attributes of the Legacy Region.
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This function is used to discover the granularity of the attributes for the memory in the legacy
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region. Each attribute may have a different granularity and the granularity may not be the same
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for all memory ranges in the legacy region.
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@param This[in] Indicates the EFI_LEGACY_REGION2_PROTOCOL instance.
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@param DescriptorCount[out] The number of region descriptor entries returned in the Descriptor
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buffer.
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@param Descriptor[out] A pointer to a pointer used to return a buffer where the legacy
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region information is deposited. This buffer will contain a list of
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DescriptorCount number of region descriptors. This function will
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provide the memory for the buffer.
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@retval EFI_SUCCESS The information structure was returned.
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@retval EFI_UNSUPPORTED This function is not supported.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegionGetInfo (
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IN EFI_LEGACY_REGION2_PROTOCOL *This,
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OUT UINT32 *DescriptorCount,
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OUT EFI_LEGACY_REGION_DESCRIPTOR **Descriptor
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)
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{
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return EFI_UNSUPPORTED;
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}
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/**
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The user Entry Point for module LegacyRegionDxe. The user code starts with this function.
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@param[in] ImageHandle The firmware allocated handle for the EFI image.
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@param[in] SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The entry point is executed successfully.
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**/
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EFI_STATUS
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EFIAPI
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LegacyRegion2Install (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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//
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// Make sure the Legacy Region 2 Protocol is not already installed in the system
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//
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ASSERT_PROTOCOL_ALREADY_INSTALLED (NULL, &gEfiLegacyRegion2ProtocolGuid);
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//
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// Install the protocol on a new handle.
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//
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Status = gBS->InstallMultipleProtocolInterfaces (
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&mLegacyRegion2Handle,
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&gEfiLegacyRegion2ProtocolGuid, &mLegacyRegion2,
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NULL
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);
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ASSERT_EFI_ERROR (Status);
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return EFI_SUCCESS;
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}
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